① Polyurethane ② Acrylic acid ③ Polymer cement ④ Cement mortar. In terms of waterproof performance, the best of these four types of waterproof coatings is polymer >: polyurethane >: acrylic acid > cement mortar.
Polyurethane waterproof coating is known as "liquid rubber" and is one of the best waterproof coatings with comprehensive properties at present. The coating is tough, high in tensile strength, good in ductility, strong in corrosion resistance, strong in structural expansion and deformation resistance and long in service life. But it smells, and black is not environmentally friendly.
Acrylic waterproof coating is a one-component, environment-friendly elastic waterproof coating. It is based on self-crosslinking pure acrylic emulsion, with special modifiers, functional additives and fillers, and is made by dispersion and grinding. This material is non-toxic, harmless and non-flammable, and it is a green product. It has good elongation and tensile strength, excellent aging resistance of pure acrylic acid and long service life of waterproof layer. Moreover, the construction is convenient, and both roller coating and scraping coating can be used. The waterproof layer forms a continuous elastic membrane in contact, which is especially convenient for the construction of special-shaped parts with complex structures. Because of its stable performance, ideal application effect and moderate price, it is widely used in home decoration waterproofing. Mainly used for large-scale projects.
Polymer cement waterproof coating is a two-component waterproof material with both rigidity and flexibility. This kind of material is nontoxic and odorless, has good air permeability, strong adhesion to the base surface and fast drying, but most of them are two-component materials, and instructions are needed to guide the ratio of liquid to powder. In addition, if too much talcum powder is added to the powder, the properties of the material will be greatly reduced. In order to avoid buying inferior products, we should choose formal channels to buy brand products. Mainly used for home decoration.
Mortar waterproof coating is a two-component water-based waterproof mortar, which consists of organic emulsion composed of acrylate emulsion and various additives, and inorganic powder composed of special cement and various fillers in a certain proportion. This kind of paint is non-toxic, harmless and pollution-free, and it is a real environmental protection paint. Can be directly coated on the concrete surface, and has firm bonding. Convenient construction, not limited by the moisture content of the base, fast drying and short setting time, and ceramic tiles can be pasted on the surface after 2 hours of construction. However, because this kind of material belongs to rigid waterproof coating, it lacks elasticity after film formation, which will affect the waterproof effect because of the sinking and dislocation of the building, and is generally suitable for the parts with relatively stable structure.